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Improper PNG image decoding using Platform Codecs

by Tanmay Anjaria / December 11, 2009 5:03 PM PST


I'm using ImageFactory interfaces for decoding the images in an application. It's working fine for all jpg and gif images.

It works fine for some png images but I face problem in decoding all the png images created using "Adobe ImageReady" software.

Only the initial part of decoded image is clear and about 70% of image is junk.

I get proper data after the IMageDecoder->GetImageInfo call with proper image width, height and bpp value.

decoding function also comes out with success but the raw data that I get after dumping is problematic.

Anyone has faced this issue before?

EXAMPLE: Try with this iamge:

And an important observation is that if you put the file in the device file system (I tried putting it in the root directory of professional emulator 6.1), and double click on it to open it using the default application, then too it gives the same junk image, But IE on windows mobile which also uses platform codecs (my assumption) decodes it properly.

Any idea what change should I make to make it work?

Tanmay Anjaria
Bangalore, India

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by R. Proffitt Forum moderator / December 11, 2009 9:47 PM PST

That's a problem with many systems. Look at what IRFANVIEW did to get around that. VLC PLAYER did the same thing. What did they do? Both of those don't rely on platform codecs.

This is not an offer of helping you find these but to show that you can't rely on platform codecs. It's an old problem that's been with us since day one.

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I think you're right...
by Tanmay Anjaria / December 13, 2009 7:41 PM PST
In reply to: Yup.

It occured to me and I've already moved to open source libs for my imaging module.

But the height is that not only their platform does not support it, they do not "support" their platform too. I've got no reply from MSDN forums for a long time now... Not only for this but many issues...

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Here's the reply I got.
by R. Proffitt Forum moderator / December 13, 2009 9:17 PM PST

"That's an invalid file." Since the platform codec does not decode it, they call it corrupt or invalid. If you were in their camp you can see why they do that.

Again, all you can do is to write in deep detail what formats your app will work with. That's what I had to do.

Yes, given more money and time we could write decoders and such but it is not in our budget.

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